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(No Model.) 2 Sheets-Sheet 1. J. STOTT.

SMOKE PREVENTING STOVE.

' No. 398,862. Patented Mar. 5, 1889.

Q V vtweoaao, I gwqentoz Mme/ M 5% (No Model.) 2' Sheets-Sheet 2. J. STOTT.

SMOKE PREVENTING STOVE.

No. 398,862. Patented Mar. 5, 1889.

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qwilcmeooeo UNITED STATES PATENT OFFICE.

JOHN STOTT, OF AURORA, ILLINOIS.

SMOKE-PREVENTI NG STOVE.

SPECIFICATION forming part of Letters Patent No. 398,862, dated March 5, 1889.

Application filed October 20, 1888. Serial No. 288,622. (No model.)

enable others skilled in the art to which it ap- 5 pertains to make and use the same, reference They may however be solid. I have shown a 1 single row of them; but more rows may be used.

The firebox or combustion-chamber is constituted as follows, viz: by the grate for its bot-tom, by the end plates, I K, for its ends, and by the arched plate L for its vertical sides and curved or semicircular top, this plate L extending without break or opening from one end plate to the other, and also extending being had to the accompanying drawings, and to letters of reference marked thereon, which 3 and extended hot-air passage and chamber at form a part of this specification.

My invention belongs to that class of heatingstoves in which the draft is downward through the ignited fuel; and it consists in a special construction having for its object the preventing of smoke in burning bituminous j coal or other fuel usually producing much smoke, and it is based on the theory now generally adopted by scientific men that smoke when generated in stoves or furnaces cannot be consumed, but that its generation can be wholly or partially prevented.

My invention aims at great simplicity in design and in construction, and it is applicable to stoves of any form, plain or ornamental, horizontal or vertical, according to the special use to which it is to be put or to the taste of the designer.

In the drawings, which illustrate it as applied to the simplest form of heating-stove, Figure 1 is a perspective view; Fig. 2, a longitudinal section; Fig. 3, a front end elevati0n;Fig. 4, a rear elevation; Fig.5, a central cross-section.

A is the outer shell or box, provided with the requisite doors, (B for feeding in the fuel, 0 for a draft-door, and D for the ash-pit door), and also having the outlet E, at which the stove-pipe may be attached.

F is a grate, which is shown as extending the whole length of the shell or box, and above which is the fire box or combustion-chamber G and belowit the ash-chamber H.

The two end plates, I K, in which are the doors, may be made of cast-iron, wronght'iron, or of steel-plate, as preferred, as may also the other parts. The grate-bars are preferably tubular, as shown, extending from end to end, so that the air may circulate through them.

without break or opening down to the lower side of the grate, thereby leavinga continuous both sides the stove, such space extending not only the entire length of the stove at such sides, but also extending its entire length at the top, inasmuch as the arched portion at the top of the box and the arched portion at the top of the plate L are parallel and are equal in length and are about the same distance apart as are the sides distant from each other. This fire-box or combustion-chamber, as plainly shown, is made considerably smaller than the outer shell or casing, A, in order to provide suiiicient space, M, between such fire-box and casing to serve as a flue, and as the only flue or outlet through which the products of combustion may pass on their way to the stove-pipe. This arched plate L thus not only acts as a deflector or rcverberator of heat, but it positively and absolutely compels all products of combustion seeking to escape or driven by blast or blower to pass down through the ignited fuel on the gratebars, and thus to be consumed, so that no smoke is generated and none maypass out of the outlet E.

The draft-door C is provided with a suitable register-slide or dampers, N, for covering and uncovering at will the draft-holes O, of any desired size and number.

In practice, the fuel being put in at the door B and spread over the grate-bars, the draftis i applied and regulated through and by means of the slide registers or dampers. The ashpit door is then closed tight. The coal being then ignited by means of kindlings and all the doors closed except the registers in the draftdoor C, it will be apparentthat all the the products of combustion, having no other avenue of escape, must pass down and through the fuel and through the grates, and that in so doing the gases or other matter, which, if imperfectly burned, would make smoke it allowed to pass upward, are consumed, and no smoke is made, and that the route of the heated air after so passing down through the fuel is next upward, as shown by the arrows, at opposite sides of the structure and for its entire length and breadth through the equal and similar side spaces, M, left between the plate and the outer wall or box, and thence into the arched part of this continuing space or flue-passage, this entire interior area of the shell or box constituting, in connection with the entire exterior surface of the plate L, an unbroken heating-chamber and fluepassage having no escape or outlet except through the pipe or outlet E, and there is no needed connection or contact of the arched plate L with the shell A, excepting at the ends, and therefore no impediment to the free passage of the products of combustion on their way to the outlet E. Besides the main object of preventing smoke, the construction also generates an unusual amount of heat in a given amount of fuel by consuming those products of combustion which usually escape and are lost.

In practice I find that with my construction I can when using bituminous coal alternate it with wood as the fuel, and that no smoke is perceptible in or passing through the outletpipe, so that, in fact, a smoke-pipe merely for carrying off smoke may be dispensed with. The combustion is slow and so perfect as to leave nothing further in this respect to be desired, and practically all the heat may be utilized, while, as is well known, in burning bituminous coal generally from seventy-five to eighty per cent. is wasted. There is no upward passage of air through the fuel either in starting or in continuing the fire. It is always downward.

I claim 1. A smoke-preventing stove adapted for burning bituminous coal, having within its outer case an inner arched plate, L, placed substantially parallel with such case and connected with both end plates of the stove, such plate having no opening therein, and provided with opposite vertical sides both extending down to the under side of the grate, leaving a free heating and flue passage from the under side of the grate up and between such sides and the entire inner side of the case, which is above the grate, the plate constituting, with the grate, the combustion-chamber and serving to compel all the products of combustion to pass downward through the ignited fuel.

2. In combination with outer shell, A, having the top outlet, E, the arched plate L, applied relatively to the shell as set forth and leaving a continuous flue-passage aroundthe whole surface of the plate, and a grate located between the two lower ends of said plate and extending through the stove and supported at both ends in and by the end plates of the stove, all substantially as described.

3. In combination, the shell A, having outlet E, plate L, applied thereto and to the grate, as shown and described, feed-door B, draft-door C at the opposite side or end of the stove and provided with a regulating.

register, and a tight-fitting door for the ashpit, the construction also compelling the air to pass downward through the fuel and grate, all substantially as set forth.

JOHN STOTT. Vitnesses:

E. T. PRINDLE, M. O. SOUTHWORTH. 

